Product description

The advanced steelmaking, rolling, and heat treatment processes developed by Baosteel have resulted in a series of ultra-high strength structural steel products. These products exhibit excellent low-temperature toughness, weldability, and cold formability in addition to their ultra-high strength. They also have stable and uniform performance, as well as good shape and surface quality. These products are suitable for use in various industries, such as the manufacturing of engineering machinery, crane, pump truck, and vehicle structures.

Manufacturing process and delivery status

BS series ultra-high strength steel is produced by smelting killed steel in an oxygen converter and refining it outside the furnace. The resulting continuous casting billet is then reheated and rolled into coils using a controlled rolling and cooling process at the hot rolling plant. After this, the plate undergoes refining, straightening, and cutting. Based on the required performance, the appropriate heat treatment process is chosen, and the steel is delivered in its treated state.

Material Grade/Composition and Properties

Grade	Chemical composition%					Mechanical properties
	C	Si	Mn	S	Alt	YS(MPa)	TS(MPa)	EL(%)
BS800QC	≤0.12	≤0.50	≤2.00	≤0.010	≥0.015	≥800	≥850	≥10
BS900QC	≤0.12	≤0.50	≤2.00	≤0.010	≥0.015	≥900	≥950	≥10
BS960QC	≤0.12	≤0.50	≤2.00	≤0.010	≥0.015	≥960	≥980	≥8

Grade	Chemical composition%
	C	Si	Mn	Cr	Mo	P	S	Alt	B
BS900D	≤0.20	≤0.50	≤2.00	≤1.00	≤1.00	≤0.015	≤0.005	≥0.015	≤0.005
BS960D	≤0.20	≤0.50	≤2.00	≤1.00	≤1.00	≤0.015	≤0.005	≥0.015	≤0.005
BS1100D	≤0.22	≤0.50	≤2.00	≤1.00	≤1.00	≤0.015	≤0.005	≥0.015	≤0.005
BS1300D	≤0.30	≤0.50	≤2.00	≤1.00	≤1.00	≤0.015	≤0.005	≥0.015	≤0.005

Grade	Mechanical properties
	YS(MPa)	TS(MPa)	EL(%)
BS900D	≥900	≥950	≥12
BS960D	≥960	≥980	≥10
BS1100D	≥1100	≥1250	≥8
BS1300D	≥1300	≥1350	≥8

Grade	Chemical composition%
	C	Si	Mn	Cr	Mo	P	S	Alt	B
BS900E	≤0.20	≤0.50	≤2.00	≤1.00	≤1.00	≤0.015	≤0.005	≥0.015	≤0.005
BS960E	≤0.20	≤0.50	≤2.00	≤1.00	≤1.00	≤0.015	≤0.005	≥0.015	≤0.005
BS1100E	≤0.22	≤0.50	≤2.00	≤1.00	≤1.00	≤0.015	≤0.005	≥0.015	≤0.005

Grade	Mechanical properties
	YS(MPa)	TS(MPa)	EL(%)
BS900E	≥900	≥950	≥12
BS960E	≥960	≥980	≥10
BS1100E	≥1100	≥1250	≥8

If you are interested in our products, please feel free to contact us, we look forward to establishing a long-term cooperative relationship with you and developing together!

Material characteristics

The hot-dip Al-Zn coated steel sheet possesses several distinguishing characteristics. Firstly, it exhibits excellent machinability, making it suitable for various processing methods, including rolling and coiling. Additionally, it offers superior thermal resistance compared to standard HDG steel plates, as it can operate in environments up to 315°C for prolonged periods without undergoing color changes. Moreover, it boasts a high reflectivity, with the ability to reflect both heat and light twice as effectively as hot-dip zinc steel sheets. Its reflectivity exceeds the minimum required by the EPA Energy Star Standard, standing at over 0.70, making it an optimal construction material for energy-saving purposes.

Application field

The hot-dip Al-Zn coated steel sheet finds its application in various fields. In architecture, it is used for constructing roofs and outside walls of both civilian and industrial buildings, as well as for making garage doors, fences, and window blinds. In industrial instruments, it is employed in the manufacturing of electric control cabinets, industrial refrigeration equipment, and automatic vending machines, among others. The sheet is also utilized in the appliances industry, where it serves as outer clad sheets for washing machines, refrigerators, televisions, air conditioners, and ventilation systems. Additionally, it can be used for making explosion-proof strips, solar water heaters, and appliance parts. Other applications of the hot-dip Al-Zn coated steel sheet include the production of mufflers, heat shields for exhaust pipes and catalytic converters, auto parts and accessories under the frame, and signboards on highways.

Material Grade and Mechanical Properties

Cold forming

Grade	Mechanical properties
	YS(MPa)	TS(MPa)	EL(%)
DC51D+AZ	190~360	270~500	≥22
DC52D+AZ	140~300	270~420	≥26
DC53D+AZ	140~260	270~380	≥30
DC54D+AZ	120~220	260~350	≥36

Structural

Grade	Mechanical properties
	YS(MPa)	TS(MPa)	EL(%)
S250GD+AZ	≥250	≥330	≥19
S300GD+AZ	≥300	≥380	≥18
S450GD+AZ	≥450	≥480	≥15
S550GD+AZ	≥550	≥550	—

If you are interested in our products, please feel free to contact us, we look forward to establishing a long-term cooperative relationship with you and developing together!

Introduce

Baosteel battery case steel is a specialized material that is specifically designed to meet the demanding requirements of alkaline or secondary battery case punching. It is a perfect choice for battery cases that require high speed, deep drawing, and thinned drawing processes. Additionally, this steel grade is ideal for battery cases that have strict appearance quality requirements, ensuring that the final product has a flawless finish. Baosteel battery case steel can also be used for pre or post nickel plated battery cases. Overall, this specialized steel grade is an excellent option for manufacturers who want to produce high-quality battery cases that can withstand rigorous use and meet strict industry standards.

Material characteristics

This paragraph discusses the precision and quality standards for battery case steel used in stamping. The thickness accuracy of pitted battery case steel should be within ± 0.01mm, while the micro negative tolerance design of smooth battery shell steel should be between -0.007mm and 0.003mm for applicable thicknesses of 0.25-0.3mm. Using high purity steel can reduce defects such as 'sand hole' caused by the material, and the excellent inherent quality characteristics of the materials can also reduce 'snowflake' defects. Maintaining a high level of surface quality and control can minimize quality risks associated with stamping materials.

Material Grade and Mechanical Properties

Grade	Mechanical properties
	Hardness	TS(MPa)	EL(%)
BDCK	40-56	≥275	≥34

If you are interested in our products, please feel free to contact us, we look forward to establishing a long-term cooperative relationship with you and developing together!

Features and Applications

The material under consideration exhibits ferrite and pearlite characteristics before heat treatment, which are transformed into martensite characteristics after heat treatment. This material offers ultra-high strength, with a tensile strength exceeding 1500 MPa, making it an ideal choice for safety structures such as front and rear bumpers, A-pillars, B-pillars, and middle passages. The use of this material improves crash performance and lightens the body, while also offering good formability with complex shapes and high dimensional accuracy. Overall, the material's combination of characteristics makes it highly suitable for applications where safety and high performance are critical.

Material Grade and Mechanical Properties

Grade	Mechanical properties
	YS(MPa)	TS(MPa)	EL(%)
BR500HS	280-450	≥430	≥20
B500HS	260-420	≥410	≥25
BR600HS	300-450	≥450	≥20
B600HS	280-420	≥440	≥25
BR1200HS	≥280	≤700	≥18
B1200HS	≥220	380-700	≥22
HD950/1300HS	320-630	480-800	≥16
(BR1500HS)
HC950/1300HS	280-450	≥450	≥20
(B1500HS)
HC950/1300HS+AS	≥300	≥500	≥17
BR1800HS	≥350	≥500	≥14
B1800HS	≥300	≥450	≥18

If you are interested in our products, please feel free to contact us, we look forward to establishing a long-term cooperative relationship with you and developing together!

Features and Applications

Organizational Features:
Q&P steel comprises ferrite, martensite, and retained austenite, with a retained austenite content ranging from 5% to 10%.

Performance Characteristics:
As the martensite serves as the primary matrix phase and residual austenite participates in the deformation process, Q&P steel leverages the TRIP effect to attain a higher work hardening capacity. Consequently, it offers superior plasticity and formability when compared to equivalent ultra-high strength steel.

Main Applications:
Q&P steel finds application in automobile safety and structural parts that have intricate geometries.

Ordinary cold rolled Q&P steel

Grade	Mechanical properties
	YS(MPa)	TS(MPa)	EL(%)
HC600/980QP	600-850	≥980	≥15
HC600/960QP-EL	600-850	≥980	≥20
HC820/1180QP	820~1100	≥1180	≥8
HC820/1180QP-EL	820~1100	≥1180	≥14

Hot dip galvanized Q&P steel

Grade	Mechanical properties
	YS(MPa)	TS(MPa)	EL(%)
HC600/980QPD+Z	600~850	≥980	≥15
HC600/980QP-ELD+Z	550-800	≥980	≥20
HC820/1180QPD+Z	820-1100	≥1180	≥8
HC820/1180QP-ELD+Z	820~1100	≥1180	≥14

If you are interested in our products, please feel free to contact us, we look forward to establishing a long-term cooperative relationship with you and developing together!

Features and Applications

This steel matrix is predominantly composed of bainite and ferrite, with smaller amounts of martensite, retained austenite, and pearlite present in the structure. The resulting fine-grained structure of this steel leads to high tensile strength, and notably higher yield strength when compared to dual-phase steel of equivalent tensile strength. Additionally, it boasts superior bending and reaming performance, excellent flanging formability, and a high energy absorption capacity. As a result, this steel is ideal for use in applications such as chassis suspension, B pillars, bumpers, seat rails, and more.

Uncoated CP steel

Grade	Mechanical properties
	YS(MPa)	TS(MPa)	EL(%)
HC570/780CP	570~700	≥780	≥11
HD680/780CP	680~830	≥780	≥10
HC780/980CP	780-950	≥980	≥7
HC900/1180CP	900-1100	≥1180	≥6

Hot dip galvanized CP steel

Grade	Mechanical properties
	YS(MPa)	TS(MPa)	EL(%)
HC570/780CPD+Z	570~720	780~920	≥11
HC780/980CPD+Z	780~950	980~1140	≥7
HD660/760CPD+Z	660-820	760-950	≥11

If you are interested in our products, please feel free to contact us, we look forward to establishing a long-term cooperative relationship with you and developing together!

Microstructure

Martensite is a type of microstructure that forms in steels and other alloys when they undergo rapid cooling, such as during quenching. It is characterized by a very hard and brittle structure that is composed of needle-shaped crystals.

When a steel is heated to a high temperature and then rapidly cooled, the carbon atoms within the steel do not have enough time to diffuse and form a more stable structure, so they become trapped in the distorted lattice structure of the martensite. This results in a very hard and brittle material that is commonly used in applications such as knives, cutting tools, and springs.

The microstructure of martensite can vary depending on the cooling rate and the composition of the alloy. For example, a high carbon content will result in a more brittle structure, while a low carbon content will result in a more ductile structure.

Overall, the microstructure of martensite is characterized by a very fine and uniform structure with high strength and hardness, but also low toughness and ductility.

Performance characteristics

This material exhibits high yield and tensile strength, with a relatively low elongation property. While these characteristics make it suitable for applications requiring excellent resistance to stress and deformation, the risk of delayed cracking should be taken into account. Measures should be taken to prevent this phenomenon from occurring under high-stress conditions.

Main applications

This material is ideal for the production of basic cold-stamped components and single-section roll-formed parts. It is commonly used in the manufacturing of impact-resistant components such as bumpers, door sill reinforcement plates, and side door impact bars. These applications require a material with good cold-forming properties and the ability to withstand high impact loads.

Material Grade and Mechanical Properties

Grade	Mechanical properties
	YS(MPa)	TS(MPa)	EL(%)
Cold-rolled MS steel
HC700/980MS	700~960	≥980	≥4
HC950/1180MS	950-1200	≥1180	≥4
HC1030/1300MS	1030-1300	≥1300	≥4
HC1150/1400MS	1150~1400	≥1400	≥3
HC1200/1500MS	1200~1500	≥1500	≥3
HC1350/1700MS	1350-1700	≥1700	≥3

If you are interested in our products, please feel free to contact us, we look forward to establishing a long-term cooperative relationship with you and developing together!

Microstructure

The microstructure of the material consists of three main components: ferrite, bainite, and retained austenite. The retained austenite content in the material is within the range of 7-15%.

Performance characteristics

The excellent formability of TRIP steel is primarily attributed to the presence of residual austenite in its structure. As the material is formed, the residual austenite undergoes gradual transformation into hard martensite, which facilitates uniform deformation, resulting in a superior combination of strength and plasticity. This helps to resolve the challenge of balancing strength and plasticity. Additionally, TRIP steel boasts high impact absorption energy, high strength plasticity, and high n-value.

Main applications

The primary application of this material is in the production of parts with intricate structures, such as the B-pillar stiffening plate.

Material Grade and Mechanical Properties

Grade	Mechanical properties
	YS(MPa)	TS(MPa)	EL(%)
Common cold rolled TRIP steel
HC380/590TR	380~480	≥590	≥28
HC400/690TR	400-520	≥690	≥26
HC420/780TR	420~570	≥780	≥23

Grade	Mechanical properties
	YS(MPa)	TS(MPa)	EL(%)
Hot-dip galvanized TRIP steel
HC380/590TRD+Z	380~480	≥590	≥27
HC380/590TRD+ZF	380~480	≥590	≥25
HC400/690TRD+Z	400-510	≥690	≥26
HC400/690TRD+ZF	400-510	≥690	≥24
HC420/780TRD+Z	420~560	≥780	≥23
HC420/780TRD+ZF	420~560	≥780	≥21

If you are interested in our products, please feel free to contact us, we look forward to establishing a long-term cooperative relationship with you and developing together!

Microstructure

The predominant microstructures in DP steels are ferrite and martensite. The martensite is dispersed in the form of islands within the ferrite matrix. The ferrite matrix is soft, imparting good formability to the steel. Conversely, the martensite is hard, providing the steel with high strength. The proportion of martensite in the steel directly affects its strength, which increases with a higher proportion of harder martensite. To cater to different applications, DP steels are produced with varying yield ratios (YS/TS).

Performance characteristics

DP steels possess several distinct performance characteristics. Firstly, they exhibit no yield elongation, meaning that they maintain their shape and size under stress without undergoing significant deformation. Secondly, they do not experience room temperature aging, which can cause the material to become brittle over time. This property enhances the durability and reliability of the steel in long-term use.

DP steels also have a low yield strength ratio, which refers to the ratio of the yield strength to the tensile strength of the material. This property is advantageous for applications where deformation is desired, such as in forming or bending operations.

Furthermore, DP steels have a high work hardening index, which indicates the ability of the material to resist deformation under stress. This characteristic is particularly valuable in applications where the steel is subject to repeated loading, such as in automotive bodies.

Lastly, DP steels possess a high bake hardening value, which means that they can become significantly harder after undergoing a low-temperature heat treatment. This property improves the strength and durability of the material, making it suitable for use in high-stress environments.

Main applications

The DP series of high-strength steel is currently the preferred material for structural components in various applications. It is commonly used in the production of stiffeners, anti-collision parts, and structural components, including cross members, rails, anti-collision bars, and anti-collision bar stiffeners for automotive and industrial applications. Its superior strength and durability make it an ideal choice for these high-stress applications.

Material Grade and Mechanical Properties

Grade	Mechanical properties
	YS(MPa)	TS(MPa)	EL（≥）
HC250/450DPD+Z	250~340	≥450	≥29
HC250/450DPD+ZF	250~340	≥450	≥27
HC3D0/500DPD+Z	290~370	≥500	≥27
HC300/500DPD+ZF	290~370	≥500	≥25
HC340/590DPD+Z	340~440	≥590	≥22
HC340/590DPD+ZF	340~440	≥590	≥20
HC42D/7BODPD+Z	420~550	≥780	≥17
HC420/7BDDPD+ZF	420~550	≥780	≥15
HC500/780DPD+Z	500~650	≥780	≥14
HC500/780DPD+ZF	500~650	≥780	≥12
HC550/980DPD+Z	550~730	≥980	≥10
HC550r980DPD+ZF	550~730	≥980	≥8
HC650/980DPD+Z	650~900	≥980	≥8
HC650/980DPD+ZF	650~900	≥980	≥6
HC700/980DPD+Z	700-900	≥980	≥8
HC700/980DPD+ZF	700-900	≥980	≥6
HC740/1180DPD+Z	740~980	≥1180	≥7
HC740/1180DPD+ZF	740~980	≥1180	≥5
HC820/1180DPD+Z	820~1150	≥1180	≥6
HC820/1180DPD+ZF	820~1150	≥1180	≥4

If you are interested in our products, please feel free to contact us, we look forward to establishing a long-term cooperative relationship with you and developing together!

Microstructure

The microstructure of this steel comprises primarily of ferrite and martensite, with the latter dispersed in an island-like pattern throughout the ferrite matrix. This structural arrangement imparts good formability to the steel due to the soft nature of the ferrite, while simultaneously providing high strength owing to the hardness of the martensite. The steel's strength increases proportionally with the amount of harder martensite present. Depending on the intended application, DP steels are manufactured with varying yield ratios (YS/TS).

Performance characteristics

No yield elongation: Yield elongation is a measure of how much a material deforms before it starts to show signs of permanent deformation (yielding). A material with no yield elongation means that it will begin to deform (yield) at a specific point without stretching first.

No room temperature aging: Aging refers to changes that occur in a material over time, such as hardening or softening. Room temperature aging means that these changes occur at normal room temperatures. A material with no room temperature aging will maintain its properties over a long period without significant changes.

Low yield strength ratio: The yield strength ratio is the ratio of the yield strength in tension to the yield strength in compression. A low yield strength ratio indicates that a material has similar strengths in both tension and compression.

High work hardening index: Work hardening, also known as strain hardening, is the process by which a material becomes stronger and more resistant to deformation as it is strained. The work hardening index is a measure of how quickly a material hardens as it is deformed. A high work hardening index means that a material becomes significantly stronger as it is deformed.

High bake hardening value: Bake hardening is a process by which a material's strength increases after being baked at a specific temperature. The bake hardening value is a measure of how much the material's strength increases after baking. A high bake hardening value means that a material becomes significantly stronger after being baked.

Main applications

Currently, DP series high-strength steel is the preferred steel type for various structural components. It is commonly utilized in the production of stiffeners, structural parts, and anti-collision parts like cross members under the car, rails, anti-collision bars, and anti-collision bar stiffeners.

Material Grade and Mechanical Properties

Grade	Mechanical properties
	YS(MPa)	TS(MPa)	EL%
HC250/450DP	250~320	≥450	≥28
HC290/490DP	290~390	≥490	≥26
HC340/590DP	340-440	≥590	≥22
HC420/780DP	420~550	≥780	≥15
HC500/780DP	500-650	≥780	≥12
HC550/980DP	550~720	≥980	≥9
HC650/980DP	650~900	≥980	≥8
HC700/980DP	700~920	≥980	≥8
HC820/11800P	820~1150	≥1180	≥5

If you are interested in our products, please feel free to contact us, we look forward to establishing a long-term cooperative relationship with you and developing together!